Dislocations in ceramic electrolytes for solid-state Li batteries

Abstract High power solid-state Li batteries (SSLB) are hindered by the formation of dendrite-like structures at high current rates. Hence, new design principles are needed to overcome this limitation. By introducing dislocations, we aim to tailor mechanical properties in order to withstand the mech...

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Autores principales:	L. Porz, D. Knez, M. Scherer, S. Ganschow, G. Kothleitner, D. Rettenwander
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/de575c0b63284ffe9ed25325b724d648
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spelling	oai:doaj.org-article:de575c0b63284ffe9ed25325b724d6482021-12-02T17:20:11ZDislocations in ceramic electrolytes for solid-state Li batteries10.1038/s41598-021-88370-w2045-2322https://doaj.org/article/de575c0b63284ffe9ed25325b724d6482021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88370-whttps://doaj.org/toc/2045-2322Abstract High power solid-state Li batteries (SSLB) are hindered by the formation of dendrite-like structures at high current rates. Hence, new design principles are needed to overcome this limitation. By introducing dislocations, we aim to tailor mechanical properties in order to withstand the mechanical stress leading to Li penetration and resulting in a short circuit by a crack-opening mechanism. Such defect engineering, furthermore, appears to enable whisker-like Li metal electrodes for high-rate Li plating. To reach these goals, the challenge of introducing dislocations into ceramic electrolytes needs to be addressed which requires to establish fundamental understanding of the mechanics of dislocations in the particular ceramics. Here we evaluate uniaxial deformation at elevated temperatures as one possible approach to introduce dislocations. By using hot-pressed pellets and single crystals grown by Czochralski method of Li6.4La3Zr1.4Ta0.6O12 garnets as a model system the plastic deformation by more than 10% is demonstrated. While conclusions on the predominating deformation mechanism remain challenging, analysis of activation energy, activation volume, diffusion creep, and the defect structure potentially point to a deformation mechanism involving dislocations. These parameters allow identification of a process window and are a key step on the road of making dislocations available as a design element for SSLB.L. PorzD. KnezM. SchererS. GanschowG. KothleitnerD. RettenwanderNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Porz D. Knez M. Scherer S. Ganschow G. Kothleitner D. Rettenwander Dislocations in ceramic electrolytes for solid-state Li batteries
description	Abstract High power solid-state Li batteries (SSLB) are hindered by the formation of dendrite-like structures at high current rates. Hence, new design principles are needed to overcome this limitation. By introducing dislocations, we aim to tailor mechanical properties in order to withstand the mechanical stress leading to Li penetration and resulting in a short circuit by a crack-opening mechanism. Such defect engineering, furthermore, appears to enable whisker-like Li metal electrodes for high-rate Li plating. To reach these goals, the challenge of introducing dislocations into ceramic electrolytes needs to be addressed which requires to establish fundamental understanding of the mechanics of dislocations in the particular ceramics. Here we evaluate uniaxial deformation at elevated temperatures as one possible approach to introduce dislocations. By using hot-pressed pellets and single crystals grown by Czochralski method of Li6.4La3Zr1.4Ta0.6O12 garnets as a model system the plastic deformation by more than 10% is demonstrated. While conclusions on the predominating deformation mechanism remain challenging, analysis of activation energy, activation volume, diffusion creep, and the defect structure potentially point to a deformation mechanism involving dislocations. These parameters allow identification of a process window and are a key step on the road of making dislocations available as a design element for SSLB.
format	article
author	L. Porz D. Knez M. Scherer S. Ganschow G. Kothleitner D. Rettenwander
author_facet	L. Porz D. Knez M. Scherer S. Ganschow G. Kothleitner D. Rettenwander
author_sort	L. Porz
title	Dislocations in ceramic electrolytes for solid-state Li batteries
title_short	Dislocations in ceramic electrolytes for solid-state Li batteries
title_full	Dislocations in ceramic electrolytes for solid-state Li batteries
title_fullStr	Dislocations in ceramic electrolytes for solid-state Li batteries
title_full_unstemmed	Dislocations in ceramic electrolytes for solid-state Li batteries
title_sort	dislocations in ceramic electrolytes for solid-state li batteries
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/de575c0b63284ffe9ed25325b724d648
work_keys_str_mv	AT lporz dislocationsinceramicelectrolytesforsolidstatelibatteries AT dknez dislocationsinceramicelectrolytesforsolidstatelibatteries AT mscherer dislocationsinceramicelectrolytesforsolidstatelibatteries AT sganschow dislocationsinceramicelectrolytesforsolidstatelibatteries AT gkothleitner dislocationsinceramicelectrolytesforsolidstatelibatteries AT drettenwander dislocationsinceramicelectrolytesforsolidstatelibatteries
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Dislocations in ceramic electrolytes for solid-state Li batteries

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